https://gist.github.com/MorusPatre/4b1e93973c3e4133794512fd7eefee48 This Is a Test App to find out how to actually achieve the exact sidebar styling Apple uses for Finder, Photos etc. The crucial part is how do I make it so the symbol and name of the selected row use the accent colour with active and inactive styling rather than having the accent colour for the row background? It shouldn't be that complicated I feel like but every AI model (even Claude Fable 5) fails at that and I haven't found apps or videos where that is explained so is that just a classic case of "Apple doesn't want you to know"?

This is a very basic macOS Finder-style test app using AppKit. I am experiencing a "jump" in the vertical scroll position of my NSTableView (inside an NSScrollView) specifically when the window is resized horizontally. This happens when columns are visually added or removed. Framework: AppKit (Cocoa) Xcode/macOS: 26.2 Code: https://github.com/MorusPatre/Binder/blob/main/ContentView%20-%20Scroll%20Jump%20during%20Resize.swift

Context: I am building a macOS file (currently image only) browser using SwiftUI. The core view is a ScrollView containing a LazyVGrid. The layout is dynamic: as the window resizes, I calculate the optimal number of columns and spacing using a GeometryReader. The Issue: While scrolling is pretty smooth (thanks to custom image caching and prefetching), window resizing is significantly laggy. After having scrolled the UI stutters and drops frames heavily while dragging the window edge. The Code: https://github.com/MorusPatre/Binder